Svatopluk I of Moravia

Svatopluk I of Moravia (860-4 July 907) was the last ruler of Great Moravia, reigning from 871 to 907. Succeeding Slavomir of Moravia, he was the son of Rostislav II of Moravia, entitling him to become ruler of Great Moravia in 871 and reigning until his death in 907.

Biography
Svatopluk was the son of Rostislav II of Moravia, and he came from the Mojmirids, a dynasty of Christian Bohemians. In 870, he dethroned his uncle Rastislav, who was a vassal of Louis the German of East Francia, and he took power for himself. However, the Franks imprisoned him within a year of his seizure of power, and he was forced to pay tribute to Louis. He was allowed to expand outside of East Francia's borders, and he invaded the March of Pannonia in 882. Svatopluk established good relations with the papacy, and Pope Stephen V addressed him as "king" in an 885 letter. When he died in 907, Great Moravia disintegrated due to Magyar raids and infighting between his sons over the succession.